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Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	May 26, 2019	May 30, 2021
Lessee Disclosure [Abstract]
Operating leases, rent expense, net	$ 184.9
Lessee Operating Lease Signed Not Yet Commenced Amount		$ 87.8

X

- Definition

Minimum lease payments for operating leases committed to but not yet commenced.

+ References

No definition available.

+ Details

Name:	gis_LesseeOperatingLeaseSignedNotYetCommencedAmount
Namespace Prefix:	gis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LesseeDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41499-112717

+ Details

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration